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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Length and Barrel Volume
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<blockquote data-quote="MagnumManiac" data-source="post: 1166336" data-attributes="member: 10755"><p>What you are describing is expansion ratio, and bore cross sectional area.</p><p>Here's an example you should be able to see in any loading manual.</p><p>We have 3 chamberings using the same 30-06 parent case; 30-06, 338-06 and 35 Whelen.</p><p>As bore sectional area increases, if we take the 30-06 as the start point with a 200gr bullet at 2680fps in a 24" barrel, the 338-06 shoots the same bullet weight faster by 100fps and the 35 Whelen shoots the same weight just over 100fps faster again.</p><p>The reason for this is simple, the greater area there is on the base of the bullet, the more area there is to push on, the same reason big cubic inch engines, or those with large cylinders and short strokes, produce more torque.</p><p>The reason longer barrels produce higher velocity is due to the extra area the gas can expand into.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1166336, member: 10755"] What you are describing is expansion ratio, and bore cross sectional area. Here's an example you should be able to see in any loading manual. We have 3 chamberings using the same 30-06 parent case; 30-06, 338-06 and 35 Whelen. As bore sectional area increases, if we take the 30-06 as the start point with a 200gr bullet at 2680fps in a 24" barrel, the 338-06 shoots the same bullet weight faster by 100fps and the 35 Whelen shoots the same weight just over 100fps faster again. The reason for this is simple, the greater area there is on the base of the bullet, the more area there is to push on, the same reason big cubic inch engines, or those with large cylinders and short strokes, produce more torque. The reason longer barrels produce higher velocity is due to the extra area the gas can expand into. Cheers. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Length and Barrel Volume
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